Lenovo ThinkServer RD120 Hardware Maintenance Manual page 201

4. Locate the boot block recovery jumper block (J42) on the system board.
1
Boot block recovery jumper
2
Switch block (SW2)
5. Move the jumper from pins 1 and 2 to pins 2 and 3 to enable the BIOS
recovery mode.
6. Insert the BIOS recovery diskette into the diskette drive.
7. Reinstall the server cover; then, reconnect all power cords.
Attention: In a dc power environment, only trained service personnel other
than Lenovo service technicians are authorized to connect or disconnect power
to the dc power supply. See the documentation that comes with each dc power
supply.
8. Restart the server. The power-on self test (POST) starts.
9. Select 1 - Update POST/BIOS from the menu that contains various flash
update options.
10. When you are asked whether you want to save the current code to a diskette,
press N.
11. When you are asked to choose a language, select a language (from 0 to 7)
and press Enter.
12. Remove the BIOS recovery diskette from the diskette drive.
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Chapter 5. Diagnostics